欠固结土的弹塑性本构模型

An elastoplastic constitutive model for underconsolidated clay

利用插值函数法建立土的剑桥模型与修正剑桥模型,通过初始压力密度状态(欠固结程度)确定欠固结土等向压缩线的斜率,在此基础上采用插值函数法提出欠固结土的弹塑性本构模型,所建立的模型与剑桥模型具有相同的材料参数,且当初始压力密度状态位于正常固结线上时,模型可简化为剑桥模型。利用固结排水与固结不排水试验分析所提模型的功能,模型可较合理地反映欠固结土较大的体积压缩特性。

The interpolation function method was employed to establish the Cam-clay Model and Modified Cam-clay Model for normally consolidated clay.Through the initial pressure density states(the degree of underconsolidation),the isotropy compression curve's ramp rates of underconsolidated soil can be determined,on the base of which,an elastoplastic constitutive model for underconsolidated clay was proposed by employing the interpolation function method in this paper.The model established has the same material parameters as the Cam-clay Model,and when the initial pressure density states is on the normal consolidation line,it can be simplified into the Cam-clay Model.The authors analyzed the function of model established by the consolidated drainage and consolidated undrainaged tests,and the model can reflect rationally the mechanical properties of underconsolidated clay.